The character known as "Mother" is a working professional navigating the demands of her career alongside raising a family. Following the birth of her second child, Mirai, she grapples with balancing responsibilities, fatigue, and rising tensions at home, particularly with her eldest son, Kun, who resents the shift in attention toward his sister.

Time-travel sequences unravel her past, portraying her as a determined, spirited child who frequently clashed with her own mother—most notably over her wish to keep a pet cat. A defining childhood moment occurs when she observes a stray cat prey on a bird, solidifying her aversion to cats and prompting her family to adopt a dog instead. This incident profoundly influences her understanding of caregiving and accountability.

Her evolution as a parent emerges through Kun’s encounters with her younger self during his time-travel journeys. These interactions reveal her struggles to harmonize her roles as a mother, professional, and individual shaped by her history. Parallels arise between her past—such as arguments with her mother over defiance—and Kun’s present challenges, illustrating recurring themes of generational conflict and growth.

Her journey traces the shift from idealizing parental authority to acknowledging its complexities, framed by vulnerability and effort. The narrative positions her experiences as a testament to how empathy, resilience, and embracing imperfection can gradually mend fractures in familial relationships, fostering mutual understanding across generations.